package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        log.info("开始插入菜品数据");
        dishMapper.insert(dish);
        log.info("插入菜品数据成功");
        //获取返回来的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表中插入n条数据,这个菜品的id的所有口味
            dishFlavorMapper.insertBatch(flavors);

        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {

        //开启分页，剩下交给mapper
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        //装到pageresult里，然后装到result里的返回数据中
        return new PageResult(page.getTotal(),page.getResult());


    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {

        for(Long id : ids){
            //是否存在启售的菜品？
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.DISABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        log.info("检查是否被关联之前");
        //判断当前菜品是否被关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        log.info("开始检查是否被关联");
        if(setmealIds != null && setmealIds.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);//后绪步骤实现
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
        }
    }

    /**
     * 根据id查菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {

        log.info("进入实现类...");
        //根据id查菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(dish.getId());

        //全封装进dishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }


    }

    /**
     * 启用禁用菜品账号
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();

        dishMapper.update(dish);


    }

    /**
     * 根据分类id查询菜品们
     * @param id
     * @return
     */
    @Override
    public List<Dish> list(Long id) {
        Dish dish = Dish.builder()
                .categoryId(id)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);


    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}











